Thanks to all for the feedback.
I tend to agree with Scott in that skipping unused space can't possibly
work with any sort of consistency. Therefore I'll forget about it until
someone shows with data that it can be useful. For example showing a
correspondence between unused sectors and sectors containing the empty
pattern, plus a bitmap showing that the used sectors are grouped. If the
used sectors are scattered, then finding them is, as Scott said, like
playing roulette.
Thanks,
Antonio.
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